Farmer was recalled by the Tigers on Tuesday.
Daniel Norris landing on the DL on Tuesday put the Tigers in a bind in terms of pitching depth given that Jordan Zimmermann is also on the shelf with a neck injury. Farmer has shuttled between Triple-A Toledo and the majors this season with mixed results. He's worked solely as a starter with Toledo, where he's notched a 6.42 ERA across 10 starts, but he's been effective in a relief role with the Tigers (2.70 ERA in 13.1 innings). He'll probably serve as a long-relief option for the Tigers during his stint with the big league club, but he'll be a likely candidate to be sent down once either Norris or Zimmermann return.